Wells Fargo CEO can do it. IIRC it wasn't cheap unless you have high volume, though.
In general, ACH just wasn't built to accommodate "platforms" as an entity in the transaction cycle. Banks, while although cheap, have a problem reconciling their infrastructure and processes with today's expectations. Not to mention their services don't package or include other compliance required to leverage ACH legally (KYC, OFAC, reporting, reject handling, etc.).
Bottom-line: ACH and traditional providers are not suitable options for today's platforms. Among others, banks are hemorrhaging ACH-related business to companies like Stripe and Dwolla.
AFAIK, to plug in to the ACH network, you have to work with a Bank that has access to FedACH/ Electronic Payments Network. I know Dwolla has its own Payments Network, FiSync, but the number of banks on this system is very small. So in many cases its not so much that banks are hemorrhaging business, but Stripe/Dwolla are selling KYC, OFAC, reporting, reject handling, etc related services.